The Amazon Rainforest: The World's Largest Rainforest
By Rhett A. Butler [Last update Apr 4, 2024]
The Amazon River Basin is home to the largest rainforest on Earth. The basin -- roughly the size of the forty-eight contiguous United States -- covers some 40 percent of the South American continent and includes parts of eight South American countries: Brazil, Bolivia, Peru, Ecuador, Colombia, Venezuela, Guyana, and Suriname, as well as French Guiana, a department of France.
Reflecting environmental conditions as well as past human influence, the Amazon is made up of a mosaic of ecosystems and vegetation types including rainforests, seasonal forests, deciduous forests, flooded forests, and savannas.
The basin is drained by the Amazon River, the world's largest river in terms of discharge, and the second longest river in the world after the Nile. The river is made up of over 1,100 tributaries, 17 of which are longer than 1000 miles, and two of which (the Negro and the Madeira) are larger, in terms of volume, than the Congo river.
The river system is the lifeline of the forest and its history plays an important part in the development of its rainforests.
Country | Tree cover extent 2020 | Primary forest extent 2020 | Tree cover loss since 2000 | Tree cover loss 2010-19 | Primary forest loss 2010-19 |
---|---|---|---|---|---|
Bolivia | 44,854,868 | 28,815,724 | 10.0% | 3,335,988 | 1,630,465 |
Brazil | 373,904,915 | 310,498,565 | 10.2% | 22,238,014 | 12,940,179 |
Colombia | 51,027,994 | 43,336,799 | 4.1% | 1,229,310 | 774,500 |
Ecuador | 10,929,034 | 9,093,550 | 3.5% | 272,369 | 106,585 |
French Guiana | 8,114,787 | 7,805,457 | 0.9% | 43,026 | 30,305 |
Guyana | 18,908,103 | 17,168,399 | 1.1% | 143,957 | 92,979 |
Peru | 76,035,841 | 67,149,825 | 4.0% | 2,097,146 | 1,372,976 |
Suriname | 13,856,308 | 12,648,491 | 1.3% | 141,422 | 100,382 |
Venezuela | 36,247,586 | 32,441,439 | 1.6% | 375,760 | 249,075 |
TOTAL | 633,879,436 | 528,958,249 | 7.9% | 29,876,992 | 17,297,446 |
WHERE THE AMAZON RANKS AMONG GLOBAL RAINFORESTS
The Amazon is the world's biggest rainforest, larger than the next two largest rainforests — in the Congo Basin and Indonesia — combined.
As of 2020, the Amazon has 526 million hectares of primary forest, which accounts for nearly 84% of the region's 629 million hectares of total tree cover. By comparison, the Congo Basin has around 168 million hectares of primary forest and 288 million hectares of tree cover, while the combined tropical areas of Indonesia, Papua New Guinea, Malaysia, and Australia have 120 million hectares of primary forest and 216 million hectares of tree cover.
THE HISTORY OF THE AMAZON RAINFOREST
At one time Amazon River flowed westward, perhaps as part of a proto-Congo river system from the interior of present day Africa when the continents were joined as part of Gondwana. Fifteen million years ago, the Andes were formed by the collision of the South American plate with the Nazca plate. The rise of the Andes and the linkage of the Brazilian and Guyana bedrock shields, blocked the river and caused the Amazon to become a vast inland sea. Gradually this inland sea became a massive swampy, freshwater lake and the marine inhabitants adapted to life in freshwater. For example, over 20 species of stingray, most closely related to those found in the Pacific Ocean, can be found today in the freshwaters of the Amazon.
About ten million years ago, waters worked through the sandstone to the west and the Amazon began to flow eastward. At this time the Amazon rainforest was born. During the Ice Age, sea levels dropped and the great Amazon lake rapidly drained and became a river. Three million years later, the ocean level receded enough to expose the Central American isthmus and allow mass migration of mammal species between the Americas.
The Ice Ages caused tropical rainforest around the world to retreat. Although debated, it is believed that much of the Amazon reverted to savanna and montane forest (see Ice Ages and Glaciation). Savanna divided patches of rainforest into "islands" and separated existing species for periods long enough to allow genetic differentiation (a similar rainforest retreat took place in Africa. Delta core samples suggest that even the mighty Congo watershed was void of rainforest at this time). When the ice ages ended, the forest was again joined and the species that were once one had diverged significantly enough to be constitute designation as separate species, adding to the tremendous diversity of the region. About 6000 years ago, sea levels rose about 130 meters, once again causing the river to be inundated like a long, giant freshwater lake.
Note: Human populations have shaped the biodiversity of the Amazon. See Amazon people for more.
The world's largest rainforests [more] How large is the Amazon rainforest? The extent of the Amazon depends on the definition. The the Amazon River drains about 6.915 million sq km (2.722 sq mi), or roughly 40 percent of South America, but generally areas outside the basin are included when people speak about "the Amazon." The biogeographic Amazon ranges from 7.76-8.24 million sq km (3-3.2 million sq mi), of which just over 80 percent is forested. For comparison, the land area of the United States (including Alaska and Hawaii) is 9,629,091 square kilometers (3,717,811 sq km). Nearly two-thirds of the Amazon lies in Brazil. |
THE AMAZON RIVER TODAY
Today the Amazon River is the most voluminous river on Earth, carrying more than five times the volume of the Congo or twelve times that of the Mississippi, draining an area nearly the size of the forty-eight contiguous United States. During the high water season, the river's mouth may be 300 miles wide and every day up to 18 billion cubic meters (635 billion cubic feet) of water flow into the Atlantic. That discharge, equivalent to 209,000 cubic meters of water per second (7.3 million cubic feet/sec), could fill over 7.2 million Olympic swimming pools per day or supply New York City's freshwater needs for nine years.
The force of the current -- from sheer water volume alone -- causes Amazon River water to continue flowing 125 miles out to sea before mixing with Atlantic salt water. Early sailors could drink freshwater out of the ocean before sighting the South American continent.
The river current carries tons of suspended sediment all the way from the Andes and gives the river a characteristic muddy whitewater appearance. It is calculated that 106 million cubic feet of suspended sediment are swept into the ocean each day. The result from the silt deposited at the mouth of the Amazon is Majaro island, a river island about the size of Switzerland.
The Amazon's influence on the movement of moisture extends beyond the water that flows down the Amazon river. The trees of the Amazon rainforest pump vast quantities of water vapor into the atmosphere every day via transpiration. While much of this water falls locally as rain, some of this moisture is carried by airflows across other parts of the continent, including the agricultural heartland of South America to the south. This movement has been likened to "flying rivers". By one estimate, 70% of Brazil's gross national product comes from areas that receive rainfall generated by the Amazon rainforest.
THE AMAZON RAINFOREST
While the Amazon Basin is home to the world's largest tropical rainforest, the region consists of myriad other ecosystems ranging from natural savanna to swamps. Even the rainforest itself is highly variable, tree diversity and structure varying depending on soil type, history, drainage, elevation, and other factors. This is discussed at greater length in the Amazon rainforest ecology section.
AMAZON BIODIVERSITY
The Amazon is home to more species of plants and animals than any other terrestrial ecosystem on the planet -- perhaps 30 percent of the world's species are found there. The following numbers represent a sampling of its astounding levels of biodiversity:
- 40,000 plant species
- 16,000 tree species
- 3,000 fish species
- 1,300 birds
- 430+ mammals
- 1,000+ amphibians
- 400+ reptiles
THE CHANGING AMAZON RAINFOREST
The Amazon has a long history of human settlement, but in recent decades the pace of change has accelerated due to an increase in human population, the introduction of mechanized agriculture, and integration of the Amazon region into the global economy. Vast quantities of commodities produced in the Amazon — cattle beef and leather, timber, soy, oil and gas, and minerals, to name a few — are exported today to China, Europe, the U.S., Russia, and other countries. This shift has had substantial impacts on the Amazon.
This transition from a remote backwater to a cog in the global economy has resulted in large-scale deforestation and forest degradation in the Amazon — more than 1.4 million hectares of forest have been cleared since the 1970s. An even larger area has been affected by selective logging and forest fires.
Conversion for cattle grazing is the biggest single direct driver of deforestation. In Brazil, more than 60 percent of cleared land ends up as pasture, most of which has low productivity, supporting less than one head per hectare. Across much of the Amazon, the primary objective for cattle ranching is to establish land claims, rather than produce beef or leather. But market-oriented cattle production has nonetheless expanded rapidly during the past decade.
Industrial agricultural production, especially soy farms, has also been an important driver of deforestation since the early 1990s. However since 2006 the Brazil soy industry has had a moratorium on new forest clearing for soy. The moratorium was a direct result of a Greenpeace campaign.
Mining, subsistence agriculture, dams, urban expansion, agricultural fires, and timber plantations also result in significant forest loss in the Amazon. Logging is the primary driver of forest disturbance and studies have shown that logged-over forests — even when selectively harvested — have a much higher likelihood of eventual deforestation. Logging roads grant access to farmers and ranchers to previous inaccessible forest areas.
Deforestation isn't the only reason the Amazon is changing. Global climate change is having major impacts on the Amazon rainforest. Higher temperatures in the tropical Atlantic reduce rainfall across large extents of the Amazon, causing drought and increasing the susceptibility of the rainforest to fire. Computer models suggest that if current rates of warming continue, much of the Amazon could transition from rainforest to savanna, especially in the southern parts of the region. Such a shift could have dramatic economic and ecological impacts, including affecting rainfall that currently feeds regions that generate 70 percent of South America's GDP and triggering enormous carbon emissions from forest die-off. These emissions could further worsen climate change.
PROTECTING THE AMAZON RAINFOREST
While destruction of the Amazon rainforest is ongoing, the overall rate of deforestation rate in the region dropped between the mid-2000s and mid-2010s, mostly due to to the sharp decline in forest clearing in Brazil. However deforestation has been steadily rising in the region in more recent years.
Brazil's decline in its deforestation rate between 2004 and 2012 was attributed to several factors, some of which it controls, some of which it doesn't. Between 2000 and 2010 Brazil established the world's largest network of protected areas, the majority of which are located in the Amazon region. In 2004, the government implemented a deforestation reduction program which included improved law enforcement, satellite monitoring, and the provision of financial incentives for respecting environmental laws. Independent public prosecutors offices played a particularly important role in pursing illegal activities in the Brazilian Amazon. The private sector also got involved, especially after 2006 when major crushers established a moratorium on new deforestation for soy. That soy moratorium was followed by the "Cattle Agreement", which major slaughterhouses and beef processors committed to source cattle only from areas where environmental laws were being respected.
However these conservation initiatives started to break down in the Brazilian Amazon in the mid-2010s. Major cattle producers circumvented the rules through livestock laundering, while financial incentives for conserving forests failed to materialize at the expected scale needed to change landowners' behavior. The Temer and Bolsonaro Administrations dismantled environmental regulations, reduced environmental law enforcement, stripped conservation areas and indigenous territories of protections, and encouraged a wide range of industries (mining, logging, agribusiness) to expand extraction and conversion in the Amazon. In 2019, deforestation in the Brazilian started accelerating rapidly.
THE LATEST AMAZON RAINFOREST NEWS
Deforestation haunts top Peruvian reserve and its Indigenous communities (Apr 24 2024)
- Peru’s Amarakaeri Communal Reserve, considered one of the best-protected nature reserves in the world, has seen a spike in deforestation on its fringes from the expansion of illegal coca cultivation and mining, and new road construction.
- The forest loss appears to be affecting the ancestral lands of several Indigenous communities, including the Harakbut, Yine and Matsiguenka peoples, according to a new report by the Monitoring of the Andean Amazon Project (MAAP).
- The report found that 19,978 hectares (49,367 acres) of forest have been cleared in the buffer of the reserve over the past two decades.
- According to Indigenous leaders, the state is doing “practically nothing” to address deforestation drivers in the buffer zone, and they warn that if left unchecked, the activity will spread into the protected area itself.
A web of front people conceals environmental offenders in the Amazon (Apr 22 2024)
- A paper trail left by a notorious land grabber reveals how he used relatives and an employee as fronts to evade environmental fines and lawsuits, shedding light on this widespread practice in the Brazilian Amazon.
- Fronts prevent the real criminals from having their assets seized to pay for environmental fines, besides consuming time and resources from the authorities, who spend years trying to prove who the real financier of the deforestation is.
- Experts say it’s best to go after environmental offenders where it hurts the most, by seizing their assets, rather than to chase down their true identity.
- This investigation is part of a partnership between Mongabay and Repórter Brasil.
Deforestation alerts in the Brazilian Amazon fall to a 5-year low (Apr 18 2024)
- Forest clearing detected by Brazil’s deforestation alert system fell to the lowest level in nearly five years.
- According to data released last week by the country’s space agency, INPE, deforestation registered over the past twelve months amounts to 4,816 square kilometers, 53% below the level this time last year.
- The drop in deforestation has occurred despite a severe drought affecting much of the Amazon basin.
New technologies to map environmental crime in the Amazon Basin (commentary) (Apr 12 2024)
- Environmental crimes like land grabbing, illegal deforestation, and poaching hinder climate action, deter investment in sustainable practices, and threaten biodiversity across major biomes worldwide.
- Despite challenges such as vast territories difficult to police and weak rule of law, new technologies like geospatial and predictive analytics are being leveraged to enhance the detection and disruption of these activities.
- Innovative approaches, including public-private partnerships and AI tools, show promise in improving real-time monitoring and enforcement, although they require increased investment and training to be truly effective, argue Robert Muggah and Peter Smith of Instituto Igarapé, a “think and do tank” in Brazil.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
A short walk through Amazon time: Interview with archaeologist Anna Roosevelt (Apr 10 2024)
- Anna Roosevelt has been working in the Amazon for four decades and her pivotal research has changed the knowledge of the rainforest’s occupation.
- In an interview with Mongabay, she explains how her research led to evidence of much older Amazon settlements than previously thought, challenging a decades-long scientific consensus about how Indigenous people related to the forest.
- “One reason I was able to make some great discoveries is because of how opinionated archaeologists in the mid-20th century were. I only benefited from their mistakes,” she said.
- Roosevelt said the recent hype regarding the “garden cities” in Ecuador is “annoying”, as it is not a new discovery and it ignores older research from Latin American archaeologists.
Deforestation from soy shows no sign of stopping in Cerrado, report says (Mar 21 2024)
- A recent report from Mighty Earth shows that approximately 26,901 hectares (66,473 acre) suffered deforestation and forest degradation in the Cerrado between last September and December, while 30,031 hectares (74,208 acres) were affected in the Amazon.
- Mighty Earth, in partnership with AidEnvironment and Repórter Brasil, are monitoring short-term soy and cattle ranching activities contributing to deforestation, aiming to highlight recent forest loss cases every three months.
- The report called for improved regulations that protect savanna biomes like the Cerrado, not just the Amazon Rainforest.
Ancient giant river dolphin species found in the Peruvian Amazon (Mar 20 2024)
- Paleontologists discovered a fossilized skull of a newly described species of giant freshwater dolphin in the Peruvian Amazon, which lived around 16 million years ago and is considered the largest-known river dolphin ever found.
- The ancient creature, measuring 3-3.5 meters (9.8-11.5 feet), was surprisingly related to South Asian river dolphins rather than the local, living Amazon river pink dolphin and shared highly developed facial crests used for echolocation.
- The discovery comes at a time when the six existing species of modern river dolphins face unprecedented threats, with their combined populations decreasing by 73% since the 1980s due to unsustainable fishing practices, climate change, pollution, illegal mining and infrastructure development.
- Conservation efforts are underway, including the signing of the Global Declaration for River Dolphins by nine countries and successful initiatives in China and Indonesia, highlighting the importance of protecting these critical species that serve as indicators of river ecosystem health.
Fires surge in the Amazon, but deforestation continues to fall (Mar 17 2024)
- Deforestation in the Brazilian Amazon has continued on a downward trajectory despite a sharp increase in fires associated with the severe drought in the region.
- According to data published by Brazil’s National Space Research Institute (INPE) earlier this month, forest loss in the Brazilian Amazon amounted to 5,010 square kilometers over the past twelve months, the lowest level recorded since May 2019.
- Despite the declining rate of forest loss, fires in the Amazon are on the rise, driven by the severe drought gripping the region.
- Deforestation in the Brazilian Amazon has fallen precipitously since Luiz Inácio Lula da Silva replaced Jair Bolsonaro as president last year.
Major meatpacker JBS misled the public about sustainability efforts, NY lawsuit claims (Mar 1 2024)
- New York Attorney General Letitia James filed a lawsuit against JBS USA Food Company and JBS USA Food Company Holdings for misrepresenting plans to achieve net-zero greenhouse gas emissions by 2040.
- The lawsuit cites numerous instances in which the company’s claims to the public didn’t align with what was happening behind closed doors. Its website and advertisements have boasted claims about reaching net-zero carbon emissions while company executives were making plans to grow.
- The New York attorney general said JBS Group’s greenhouse gas emissions calculations don’t include deforestation in the Amazon Rainforest, making its environmental goals “not feasible given the current scope of [its] business operations.”
New giant anaconda species found on Waorani Indigenous land in Ecuador (Feb 28 2024)
- A new species of giant anaconda has been found in the Bameno region of Baihuaeri Waorani Territory in the Ecuadorian Amazon.
- The largest snake the team found in Waorani territory was a female anaconda that measured 6.3 meters (20.7 feet) long from head to tail, but there are Indigenous reports of larger individuals.
- As apex predators, anacondas play a vital ecological role in regulating prey populations like fish, rodents, deer and caimans.
- Anacondas face a number of threats across their range, including habitat loss from deforestation, hunting by humans and pollution from oil spills.
To reverse deforestation and protect biodiversity, build a bioeconomy in the Amazon (commentary) (Feb 23 2024)
- Slowing and reversing deforestation and land degradation in the Amazon requires not only conservation efforts but also increasing the economic value of standing primary forests through a bioeconomy approach, argues Robert Muggah, co-founder of Instituto Igarapé.
- A bioeconomy involves regenerative agriculture, sustainable energy, and other activities that leverage the forest’s natural assets while ensuring economic benefits for local communities. However, the expansion of the bioeconomy faces challenges, including resistance from extractive sectors, investment risks, and the need for infrastructure, research, and support for local enterprises.
- Despite these hurdles, advancing the bioeconomy is essential for sustainable development and decarbonization in the Amazon and crucial for the world, says Muggah.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Brazil’s BR-319 highway: The danger reaches a critical moment (commentary) (Feb 17 2024)
- A project to rebuild Brazil’s notorious BR-319 highway is quickly moving closer to becoming a fait accompli. Together with planned side roads, BR-319 would open vast areas of Amazon rainforest to the entry of deforesters. A working group convened by the Ministry of Transportation will soon release a report intended to justify approval of the project’s environmental license. Congressional approval of legislation to force granting the license is also looming.
- Despite a constant political discourse claiming that governance will contain deforestation and tourists will admire the forest from their cars as they drive on a “park road,” the reality on an Amazon frontier is very different. Most of what happens once access is provided by road is outside of the government’s control.
- The consequences of unleashing deforestation in the last great block of Amazon forest would be catastrophic for Brazil, threatening the water carried to São Paulo by the winds known as “flying rivers” and pushing global warming past a tipping point.
- An earlier version of this text was published in Portuguese by Amazônia Real. It is a commentary and does not necessarily reflect the views of Mongabay.
PICTURES OF THE AMAZON RAINFOREST
Blackwater lake and whitewater river in the Amazon
Victoria water lilies
Flowering tree in the Amazon rainforest canopy
Waura shaman
Oxbow lake in the Amazon
Cock-of-the-rock
Blue poison dart frog
Leaf katydid
Jaguar in the Colombian Amazon
Hoatzin
Creek in the Colombian Amazon
Passion flower in the Colombian Amazon
Woolly monkey
Javari River
Daybreak over the Amazon
Amazonian wax-tailed fulgorid
Amazon rainforest canopy in Brazil
Discus
Rivers in the Amazon rainforest
Squirrel monkey in the Amazon
Leaf-cutter ant in the Amazon
Giant monkey frog
Amazon rainforest canopy in Peru
Orange planthopper in Peru
Oxbow lake in the Amazon
Indigenous man with bird eggs
Indigenous Tikuna man in the Amazon rainforest
Javari river in the Amazon
Harpy eagle
Mantid in Suriname
Amazon leaf toad
Amazon bat
Angelfish
Frequently asked questions about the Amazon, answeredWhere is the Amazon rainforest?
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